After lung and breast cancer for women and prostate cancer for men, colon cancer is the third most common cause of cancer death. "Cancer is a collection of cells that grow out of control, typically forming a tumor mass," says Dr. Randall Holcombe from Mount Sinai. "With colon cancer, this uncontrolled growth starts in the colon, also known as the large intestine or large bowel." More than 140,000 new cases of colon cancer were diagnosed in this country last year. One in 14 Americans will get colon cancer in their lifetime. Learn more